Distribution name 'Lognormal' is unrecognized

I previously could run this line of code, however now it seems that makedist does not recognize it as I get the error, "Distribution name 'Lognormal' is unrecognized." The line of code is simply:

pd_frag{iDG}{iDM}=makedist("Lognormal",log(lam(iDM,iDG)),zeta); 

when I check makedist, I only see six distributions loguniform, multinomial, normal, piecewiselinear, triangular, and uniform. I checked license('test', 'Statistics_Toolbox') and I get a 1 in return, so I'm assuming that's not the issue. My version is: MATLAB Version: 24.2.0.2773142 (R2024b) Update 2

Any ideas? Thanks

[Walter Roberson]

What do you get if you use

prob.ProbabilityDistributionRegistry.list('parametric')

?

Try also

makedist('-reset')

and then try your makedist again.

[Joy Shen]

the first also gives me the same 6 distributions I listed, and nothing seemed to happen when i did the second line of code. I restarted Matlab and tried the reset line again and no change.

Answer 1

[Walter Roberson]

It sounds as if you have Simulink Design Optimization installed, getting https://www.mathworks.com/help/sldo/ref/makedist.html but that you do not have Statistics and Machine Learning toolbox installed.

[Joy Shen]

I find it strange, when I type ver I don't see the Statistics and Machine Learning Toolbox pop up but looking at my Add-Ons, it says it's installed. Additionally when I run license('test','Statistics_Toolbox') it returns a 1.

[Walter Roberson]

license test does not tell you anything about whether you have the software installed: it just tells you that your license includes Statistics and Machine Learning Toolbox.

I recommend re-installing the toolbox. First use the Add-Ons to select the toolbox, and from there "Manage" the toolbox and uninstall it. Then re-install.